// ランダムに画像を表示する
function headimage()
{
img = new Array();

img[0] = "http://www.iidawave.com/dl/data/topimage/file/01.jpg";
img[1] = "http://www.iidawave.com/dl/data/topimage/file/02.jpg";
img[2] = "http://www.iidawave.com/dl/data/topimage/file/03.jpg";
img[3] = "http://www.iidawave.com/dl/data/topimage/file/04.jpg";
img[4] = "http://www.iidawave.com/dl/data/topimage/file/05.jpg";
img[5] = "http://www.iidawave.com/dl/data/topimage/file/06.jpg";
img[6] = "http://www.iidawave.com/dl/data/topimage/file/07.jpg";
img[7] = "http://www.iidawave.com/dl/data/topimage/file/08.jpg";
img[8] = "http://www.iidawave.com/dl/data/topimage/file/09.jpg";
img[9] = "http://www.iidawave.com/dl/data/topimage/file/10.jpg";
img[10] = "http://www.iidawave.com/dl/data/topimage/file/11.jpg";
img[11] = "http://www.iidawave.com/dl/data/topimage/file/12.jpg";
img[12] = "http://www.iidawave.com/dl/data/topimage/file/13.jpg";
img[13] = "http://www.iidawave.com/dl/data/topimage/file/14.jpg";
img[14] = "http://www.iidawave.com/dl/data/topimage/file/15.jpg";
img[15] = "http://www.iidawave.com/dl/data/topimage/file/16.jpg";
img[16] = "http://www.iidawave.com/dl/data/topimage/file/17.jpg";
img[17] = "http://www.iidawave.com/dl/data/topimage/file/18.jpg";


n0=Math.floor(Math.random()*17);
n1=(n0+Math.floor(Math.random()*16)+1)%17;
n2=(n1+Math.floor(Math.random()*16)+1)%17;
n3=(n2+Math.floor(Math.random()*16)+1)%17;
n4=(n3+Math.floor(Math.random()*16)+1)%17;
n5=(n4+Math.floor(Math.random()*16)+1)%17;
n6=(n5+Math.floor(Math.random()*16)+1)%17;
n7=(n6+Math.floor(Math.random()*16)+1)%17;
n8=(n7+Math.floor(Math.random()*16)+1)%17;
n9=(n8+Math.floor(Math.random()*16)+1)%17;
n10=(n9+Math.floor(Math.random()*16)+1)%17;
n11=(n10+Math.floor(Math.random()*16)+1)%17;
n12=(n11+Math.floor(Math.random()*16)+1)%17;
n13=(n12+Math.floor(Math.random()*16)+1)%17;
n14=(n13+Math.floor(Math.random()*16)+1)%17;
n15=(n14+Math.floor(Math.random()*16)+1)%17;
n16=(n15+Math.floor(Math.random()*16)+1)%17;
n17=(n16+Math.floor(Math.random()*16)+1)%17;
n18=(n17+Math.floor(Math.random()*16)+1)%17;

document.write("<img src='"+img[n0]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n1]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n2]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n3]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n4]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n5]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n6]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n7]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n8]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n9]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n10]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n11]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n12]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n13]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n14]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n15]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n16]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
document.write("<img src='"+img[n17]+"' border='0' width='716' height='309' alt='IIDA WAVE イイダ・ウェーブ'>");
}